Speed-gear for boring-mills.



F. F. CLARKE.

SPEED GEAR FOR BORING MILLS.

APVLICATION FILED DEC-3. I914.

Patented. May 30,1916.

4 SHEETS-SHEET I.

ll llll llllllllllllIIIHIIIIHII INVIEN'IOR ATTORNEY WITNESSES F. i CLARKE.

SPEED GEAR FOR BORING MILLS.

APPLICATION FILED DEC-3| I914- Patented May 30, 1916.

4 SHEETS-SHEET 2.

WITN ESSES F. F. CLARKE.

I SPEED GEAR FOR BORING MILLS.

.APFLICATION FILED 050.3. 1914.

Patented May 30,1916.

4 SHEETS-SHEET 3.

F. F; CLARKE.

SPEED GEAR FOR BORING MILLS.

APPLICATION FILED DEC. 3. I914.

Patented May 30,1916.

4 SHEETS-SHEET 4.

IIIIIIA III! 1:11 1111!!!! 11/1 WITNESES pnrr eerie.

FREDERICK F. CLARKE, 0F FRANKLIN, PENNSYLVANIA, ASSIGNOR T0 COLBURN MACHINE TOOL COMPANY, OF FRANKLIN, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

SPEED-GEAR FOR BORING-MILLS.

Specification of Letters Patent.

Patented May 3t), 121%..

Application filed December 3, 1914. Serial No. 875,829.

To all whom it may concern Be it known that I, FREDERICK F. CLARKE, citizen of the United States, residing at Franklin, in the county of Venango and State of Pennsylvania, have invented certain new and useful Improvements in Speed- Gears for Boring-Mills, of which the following is a specification.

The object, construction and operation of my improved speed gear for boring mills, are herein set forth with sufficient clearness to enable those skilled in the art of boring mill construction, to make'and use the same.

The object of this invention is to provide a simple, easily operated speed changing mechanism for the driving gear of the table of a vertical boring and turning mill, and to provide said gear with an index system which will inform the operator what to do in order to secure any possible speed change, and will also plainly indicate to him what speed is being employed.

The construction whereby these objects are attained is clearly shown in the draw ings, the various figures of which are as follows a Figure 1 is an elevation of a portion of said gearing, showing the speed-changing devices which cooperate therewith. Fig. 2 is a central horizontal section of the speed-changing mechanism, or manipulating means whereby said changes are efl'ected. Fig. 3 is a front elevation of said manipuiating devices, showing especially the index system which is employed in connection therewith. Fig. 4 is an elevation of additional gearing which cooperates with that shown in Fig. 1, and which is partially indicated by dotted lines in said Fig. 1. Figs. 5, 6 and 7 are details of the mechanism shown in Fig. 4. Figs-8, 9 and 10 are de tails of the mechanism shown in Fig. 1.

lit is believed that the construction and operation of this speed-changing mechanism will he better understood, if a definite line of drive through the various gears 'is first p0llt@d-0ut, and this Twill now proceed to o.

Themain drive pulley is mounted upon ing application Serial No. 87 5,332 for a atent for improvements in multiple-disk From said shaft 2, the transmission is through the gears 3, 4 and 5, to the shaft 6, thence through the bevel gears 7 and 8 to the shaft 9, which is shown in dotted lines in Flg. 1. To said shaft 9 is keyed a gear 10,-also shown in dotted lines in Fig. 1 that meshes with and drives gear 11 which s revolubly mounted upon the main driving shaft 12 that drives the table 13. Mounted upon and feathered to said shaft 12, is a longitudinally-movable clutchelement 1d which may be placed in engagement with a cooperating clutch-element carried by the 4 gear 11, or a cooperating clutch-element earned by the adjacent end of the gearsleeve 15, which sleeve is also revolubly mounted upon said shaft 12. When said clutch 14 is in the position shown, (Fig. 1) shaft 12 is directly driven by gear 11, and from said shaft 12 motion is transmitted to table 13 by the bevel gear 13. f

I have now pointed out one line of drive from pulley 1 to table 13 disregarding the speed-changing means which it employ to secure various speeds of said table 13. lft 1s necessary, however, to be able to vary the speed of said table, and it is the construction, combination and operation of the means whereby such variations are accomplished that constitute the invention here set-forth, and particularly pointed out and defined in the claims.

said structure longitudinally upon said shaft 2, to which it is non-revolubly secured by means of a feather which slides in the seat 21. Engaging said hub 20 is a shifting-arm 22 that is connected to the vertical shaft or rod 23 which is actuated by the lever 24:. Said lever 24 is connected to the manipulating lever B by means of the reachrefer to the element 31920 as the B element? and this designation will be employed where suitable.

' rod 25. We will now find it convenient to clutch'pulleys, filed at even date herewith. From the foregoing description, it mayllo be readily understood that, by operating lever B, said B element may be shifted so that gear 19 will mesh with gear 18, and this 26 is a shifting-arm 28 secured to a vertical rod 29 which is actuated by means of the lever 30 which is connectedto the manipulating-lever A by means of a reach-rod 31. By manipulating said lever A, said A element may be shifted so that gear 26 will mesh with gear 17, when a line of drive will be established through gears 3, 4, 17, 26.

From the foregoing description, itmay be readily understood that four different speeds of the gears 7 and 8 may be secured by the manipulations of levers A and B.

It should be kept in mind that gear 11Fig. 1is driven by agear 10, previously mentioned, that is secured to the shaft 9 upon which gear 8 is mounted. Now, independently of the speed changes which may be had in the gearing shown in Fig. 4, three additional changes of speed are provided for in the gearing shown in Fig. 1 which additional changes may be secured by shifting the clutch element 14 also by shifting the unitary element composed of gears 32, 33 and collar 34, which element 323334 will be termed the cam-element, and so referred to when it is found desirable to use this term. For the purpose of shifting both said clutch-element and said camelement, I employ the double-groove cam 35, which is clearly illustrated in Figs. 8, 9 and 10. Said clutch is shifted through. the medium of the yoke-lever 36, the arm 36 of which is engaged and actuated by the cam-groove 37; said cam-element is shifted by means of the lever 38, the arm 38.of which is engaged and actuated by the camgroove 39. For the purpose of manually operating said cam 35, I provide the construction shown especially in Fig. 2 and which is further illustrated in Fig. 3, which construction is substantially as follows: For

' the purpose of revolving said cam, I mount the same upon a hollow shaft 40, to the outer end of which is attached a gear 41. Meshing with said gear 41 is a pinion 42 which is keyed to the arbor 43, and to which arbor is also keyed the driving miter-gear 44 which, in turn, meshes with and is driven by pinion 45 that is manually operated by means of the crank 46. The shaft 46 to which said crank and said pinion are secured passes revolubly through its bearing which is formed in the plate 49 and gear 48. Also keyed to said shaft 43, is a bevel pinion 47 which meshes with and actuates the indexplate 49 through the medium of gear 48. The ratio of gear 48 to pinion 47 being three-to-one.

Lever 50' does not relate to the speedchanging mechanism but is for the purpose of starting and stopping the machine, also for locking the gears above described and the cylindrical cam in their various adjusted positions, and. the operation of said lever and said locking mechanism will be fully described in due order.

With reference to the changes of speed which it is possible to secure in the gearing shown in Fig. 1, they are as follows: As previously stated, sleeve 15 is revolubleupon its shaft 12 and is operatively connected thereto by the clutch 14. Gears 51 and 52 are keyed to the sleeve 15; gear 53 is keyed to shaft 54 and the cam-element (32-33-34) is movable longitudinally upon said shaft 54 by means of the lever 38, and is positively driven by said shaft. When clutch member 14, which is positively driven byshaft 12 is in the position shown, shaft 12 is driven directly by gear 11, and gears 32, 51, 52 and 53 are merely idlers; when said clutch is shifted to engage said sleeve 15 the line of drive is through gears 11, 53, 32 and 52. Now, if the clutch remains in engagement with said sleeve, and gear 33 is caused to mesh with gear 51, then the line of drive is through gears 11, 53, 33 and 51.

The three variations of speed just described, multiplied by the four variations of speed previously described, gives a total of twelve variations.

The positions of the levers A and B, also the manipulation of crank 46as indicated by the index plate 49necessary to secure said speed changes, will now be pointed out. Upon the escutcheon 49, through which the handles of levers A and B project, are placed the letters R and L, which indicate right and left, respectively, as the operator faces the escutcheon. Also located centrally above the index plate 49 are the letters A and B; upon said index platewhicl1 is revoluble-are located three equally-spaced,

radially disposed columns of index; the figures in said columns indicate the number of revolutions per minute which it is possible to obtain, which are, 3, 4, 6, 8; 11, 15, 21, 29; 39, 5s, 73 and 100.-

Now, inasmuch as the respective positions 49 in which is contained said number 100; he then turns crank 46 until said column is vertically-positioned beneath said letters A and B as shown. By referring to line 4 of said index in which the number 100 occurs, it will be noted that the letter R is beneath the letter A upon the escutcheon, which indicates that lever A should be positioned to the right; it will likewise be noted that the letter L on the index is beneath the letter B on the escutcheon, which notes that lever B should be positioned to the left, and this is precisely the arrangement shown in said Fig. 3. With plate 49 remaining in the same position, and both levers positioned to the right, a speed of 73 will be obtained; with both levers to the left a'speed of 53, and with lever A to the left and lever B to the right, a speed of thirty-nine R. P. M. of

. the table will be had.

. index disk 49 informs the operator precisely what to do, and shows him plainly what is necessary to be done in order to secure a desired speed, also what speed is being developed at any time.

It is necessary to provide means for looking the speed changing devices in their respective adjusted positions, so that the gears cannot be shifted while the machine is in motion, as this would be liable to cause damage to the gears, and possibly to other parts of the machine.

It is also necessary to provide means for operating the clutch in the main driving .pulley 1, to stop and start the machine; in

addition to these requirements it is also necessary to provide a brake whereby the momentum of the moving parts may be instantly checked immediately upon the disengagement of said clutch.

T accomplish all of the above functions by means of the lever 50 which is secured to shaft that extends through the hollow shaft 40. A partial turn or rotation of said shaft 55 accomplishes all of said functions through the instrumentalities of the following elements: The clutch mechanism within the hub of pulley 1 is engaged and disengaged by a lever 56,Figs. 1 and 4that is connected to the outer end of rod 57 that extends through shaft 2 and has communication with the interior of the hub of said pulley l. Said clutch mechanism is fully shown and described in an application filed at even date herewith Serial No. 875,332 for cially in Figs. 6 and 7. To the vertical shaft 23 is rigidly secured a collar 59, the

periphery of which is supplied with two notches 60 and 61; the vertical shaft 29 is gears to which it is operably connected.

Said rod 65 is also supplied with a downwardly-extending pin 66, arranged to occupy either of the notches 60 or 61 of said collar 59, and in a like manner as above stated. prevent the actuation of lever 24 and the shifting of the gears to which said lever is operably connected. When lever 50 is actuated to stop the machine, the pins are thereby withdrawn from their locking positions in the collars 59 and 62, and this will permit the shifting of the gears. When lever 50 is actuated to set the machine in op eration this also actuates the locking-rod 65 to lock the levers 24 and 30, thus preventing the shifting of said gears while the machine is in motion.

The locking device for the cylindrical cam 35,see Fig. 9-consists of a lockingbolt 78, mounted adjacent to one end of said cam, which bolt is adapted to move longitudinally. When in the locking position, the inner end of said bolt occupies one of the sockets 79 in the adjacent end of said cam. The outer end or head of said bolt 78 bears against the actuating collar 80, that is secured to the rod 55, which is actuated by said lever 50. A spring 81 surrounds said bolt and bears against the head of same and exerts an outward pressure thereon, which operates to move said bolt outwardly or to hold it in firm contact with the adjacent lateral face of said collar 80; said face is provided with a cam-notch 82, and when rod 55 is actuated to stop the machine, said notch is moved into juxtaposition to the head of said bolt 78, thus permitting the outward movement of same through the actuation of said spring 81, and its withdrawal and disengagement from cam 35, thus permitting the actuation of said cam for the shifting of the gears and the clutch element which are ac tuated thereby. In this locking device, when lever 50 and rod 55 are actuated to start the machine, the consequent turning of collar 80 thrusts bolt 78 into a socket 79, thus locking said cam in position, and prevents its actuation while the machine is in motion.

The brake referred to, consists of a drum i 67 which-is keyed to the shaft 2. A brake- 'band 68 passes around said drum. To either thus releasing the tension of band 68 upon drum 6?. The lower end of said bolt 72 is engaged bv one end of a brake-lever 74; to the other end of said lever is connected the lower end of a link 75- which, at its upper end is connected to the knuckle 76, that is also attached to said rod 55.

From the foregoing description, it may be readily understood that, when lever 50 is thrown in one direction it causes the disengagement of the clutch-pulley 1, tightens band 68 upon the brake,thus instantly stopping the machine-releases the lockingrod from its engagement with collars 59 and 62 and also unlocks cam 35, and that a reverse movement of said lever will cause areverse action of all of said functions, at

the same time, setting the machine in motion.

I claim the following:

1. A drive for the table of a boring mill, adapted to drive said table at various speeds, comprising a plurality of driving members, a portion of which are shiftable to operably engage other of said members, a plurality of shifter-elements operable to shift said shiftable members, indicative means carried by one of said shifter-elements indicating the obtainable speeds and the various positions of each shifter-element respectively, which will cause any of said speeds.

2. A drive for the table of a boring mill adapted to drive such table at various speeds, said drive comprising gear-members, a portion of which are shiftable to operably engage other of said members, also a clutchmember shiftable to diflerent elements of said gear members, a plurality of elements each operable to shift one of said shiftable elements and one of said elements being also operably connected to said clutch, and indicative means carried by one of said-shifting-elements adapted to indicate the various respective positions of each of said shifting elements that will cause said various speeds.

3. A drive for the table of a boring mill adapted to drive such table at various speeds,-said drive comprising a plurality of gear-members, a portion of which are shiftable to operably engage other portions thereof, also a clutch member operable to engage different members of said gear-members, a plurality of shifting-elements each operable to shift one of said shiftable elements, and one of said elements being also operably connected to said clutch, indicative means carried bv one of said shiftingelements adapted to indicate the various respective positions of each of said shifting elements to obtain said various speeds.

4. A drive for the table of boring mills adapted to drive said table at various speeds and comprising a plurality of, driving members, a portion of which are shiftable to operably engageother of said members, a plurality of shifting-elements operable to shift said shiftable members, indicative means carried by one of said shifting-elements adapted to indicate the various respective positions of each of said shiftingelements to obtain said various speeds, a power-receiving and transmitting element, a clutch adapted to operatively connect said last-mentioned element with said driving gear and to disconnect the same therefrom, a clutch-lever positioned in proximity to said shifting-elements operable to engage and disengage said clutch, a lock arranged to simultaneously look all of said shiftingelements in the'r respective adjusted positions and to be actuated by said clutch lever, a brake-drum connected to said transmitting element, and engaging means for said brake, adapted to be actuated by said clutch-lever.

In testimony whereof I afiix ture in presence of two witnesses.

FREDERICK F. CLARKE.

Witnesses:

MARY B. ECKERT, RAY S. CLARKE.

my signa- 

